55405568 has 44 divisors (see below), whose sum is σ = 112699632. Its totient is φ = 27217920.

The previous prime is 55405561. The next prime is 55405607. The reversal of 55405568 is 86550455.

55405568 = T₃₅₇ + T₃₅₈ + ... + T₇₂₂.

It is not an unprimeable number, because it can be changed into a prime (55405561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62021 + ... + 62907.

Almost surely, 2^55405568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55405568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56349816).

55405568 is an abundant number, since it is smaller than the sum of its proper divisors (57294064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55405568 is an equidigital number, since it uses as much as digits as its factorization.

55405568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968 (or 950 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 38.

The square root of 55405568 is about 7443.4916537872. The cubic root of 55405568 is about 381.2277189164.

The spelling of 55405568 in words is "fifty-five million, four hundred five thousand, five hundred sixty-eight".